Controversial Kazakh miner Eurasian Natural Resources Corporation fell 4% after new reports surfaced that its corporate brokers had resigned and it warned of a decline in revenues.

The company - whose founding oligarchs are considering a bid and which also faces a Serious Fraud Office investigation into its African and Kazakh operations- said iron ore extraction fell 9.2% in the first quarter, below City expectations. It blamed a severe winter in Kazakhstan where temperatures dropped as low as -46 Celsius. So with weaker commodity prices, ENRC said revenues for the first three months were slightly below last year's level. On a conference call where the company refused to take questions, chief executive Felix Vulis said:

I am sure that there are a number of questions that you have regarding events over the past weeks and I would dearly like to be able to answer them each in turn. However, as you will all know we find ourselves in the unique position of being in both an offer period and in the process of an official SFO inquiry relating to a number of historical allegations.

But the overall market continued its recent rise, hitting yet another five and a half year high as the FTSE 100 climbed 9.26 points to 6592.74. Recent central bank action to boost the global economy again supported shares, with Korea the latest to cut rates. Even the fact that the Bank of England held UK rates and kept its QE programme at the same level failed to dent the optimistic tone. Better then expected UK industrial production figures and an upbeat economic forecast from NIESR also helped.

The biggest riser so far is Experian, up 75p to £12.47 after the credit checking company reported a 6% rise in full year profits to $1.19bn and said it would launch a $500m share buyback programme over the next 12 months.

Engineer IMI also pleased the market with its update, adding 59p to £13.37.

But BSkyB and TalkTalk Telecom fell back after BT unveiled more details of its proposed sports package. The two were the top fallers in the FTSE 100 and FTSE 250 respectively.

They will also be free to customers who subscribe to BT broadband, but will cost £15 a month to anyone without BT, such as Sky customers. The aggressive move steps up the competition in the broadband market, helping to push BSkyB 53p lower to 809p and TalkTalk down 30.9p to 221.6p. BT lost 6.6p to 275.7p.

Ocado shares - a strong market of late - dropped 1.4p to 208.6p as hopes that a tie up with Morrisons would be announced alongside the supermarket's trading update were dashed. Morrisons merely said discussions were continuing and a further announcement would be made when appropriate.

Morrisons' total like for like sales fell 1.8% in the first quarter, leaving its shares down 8p at 288.4p.

Still with retail SuperGroup, the fashion business behind the Superdry brand, added 5p to 725p, after reporting a rise in fourth quarter sales of 15.3% to £86.8m despite the cold weather in early spring.

Anite added 7.7p to 129.2p after the software group said full year profits would be at the top end of City forecasts, helped by strong growth in its handset testing business, although revenues would be slightly below expectations. George O'Connor at Panmure Gordon said:

Being towards the top end of profit expectations and a small miss to revenue is a sound result given the share price was expecting a full blown warning. We nudge our target price from 170p to 171p.

Barratt Developments dipped 0.6p to 319.9p despite reporting a 9.7% increase in private reservations so far this year, helped by Government plans to boost the UK housing market - notably the Help to Buy scheme announced in the Budget. The company said:

The present market backdrop, in terms of consumer demand and mortgage supply, is the most positive we have seen for five years.

Finally Quindell Portfolio, an acquisitive outsourcing and claims management business whose customers include the RAC, slumped 28% to 7.34p. Investors have been mulling over a £13m derivatives contract revealed in its results this week, related to its purchase of Accident Advice Helpline. The deal was financed by placing £17m worth of shares, with the derivatives contract designed to offer protection against a fall in the share price. Since then Quindell shares have dropped sharply.

But just ahead of the market close, Quindell issued a statement saying it knew of no valid reason for the share price drop. It said it had a strong balance sheet, the equity swap was not material in relation to the size of the company and was not likely to be exercised until the share price was substantially higher.